Statement said to a person when they are extremely upset or mad about something, especially if they are bitching.
Automatic response to someone who is enraged
Usually said in a calm voice in response to an angered individual
"Dude, I can't believe my wife cheated on me and is getting all my money from the divorce!"
"You mad as cheese"
"FUCKKKK, MY CAR WAS STOLEN!!!"
"Basically, you mad as cheese"